So I'll just ask them to optionally provide a normal photograph of themselves. And thanks for checking the wording I'll take 'playing' out now.
Guys wont send you pics either James. As Amy stated, screening is mainly for the purposes of validating that they are where they say they are.
If you ask for a pic they may find that offensive because there are some escorts who dont see black/asian guys etc.
Flip it around - most escorts dont post face pics so you have no justification for asking for a pic from your client (unless you live in a really small village and are worried about exposure/bumping into someone you know - outside of this, its best not to ask for a pic lol)